Located in the picturesque Napa Valley region of California, Angwin is a charming community located in the foothills of the Mayacamas Mountains. Geographically, it is located at approximately 38.5742° N latitude and 122.4383° W longitude, offering stunning views of the surrounding vineyards and lush landscapes. Affiliated with the United States, Angwin is known for its tranquil atmosphere, close-knit community, and proximity to world-renowned wineries. The town has a population of approximately 3,000 residents and covers an area of 4.5 square miles (11.6 km²), making it a small yet vibrant destination in the heart of wine country.
While Angwin is not home to major companies or universities, it serves as the location for Pacific Union College, a private liberal arts college affiliated with the Seventh-day Adventist Church. The college campus is a significant landmark in the town, providing educational opportunities and cultural events for both students and the local community. Other notable landmarks in Angwin include Howell Mountain and the surrounding vineyards, which attract wine enthusiasts from around the world to explore and taste the renowned wines produced in the region.
Climate and Weather Overview
Angwin enjoys a Mediterranean climate characterized by warm, dry summers and mild, wet winters. Located inland from the coast, the town experiences distinct seasonal changes in temperature and precipitation, influenced by its proximity to the Pacific Ocean and the surrounding mountains. The Napa Valley region is renowned for its ideal grape-growing conditions, with warm days and cool nights contributing to the high-quality wines produced in the area.
Monthly Climate Data
The following table provides average temperature, precipitation, and sunny days for each month in Angwin:
| Month | Average Temperature (°F) | Average Precipitation (inches) | Sunny Days |
| January | 55°F | 6.14 inches | 10 |
| February | 58°F | 5.53 inches | 11 |
| March | 62°F | 5.32 inches | 13 |
| April | 66°F | 2.48 inches | 15 |
| May | 73°F | 1.14 inches | 17 |
| June | 82°F | 0.38 inches | 20 |
| July | 89°F | 0.04 inches | 23 |
| August | 89°F | 0.07 inches | 23 |
| September | 85°F | 0.41 inches | 21 |
| October | 76°F | 2.15 inches | 17 |
| November | 64°F | 4.68 inches | 13 |
| December | 56°F | 6.18 inches | 10 |
Weather by Month
January
January in Angwin brings cool, wet weather, with average temperatures around 55°F (13°C). The month is one of the wettest of the year, with significant rainfall averaging 6.14 inches (156 mm). Sunny days are limited, but when the sun does shine, residents can enjoy outdoor activities such as hiking, birdwatching, and exploring nearby parks. Indoor activities such as wine tastings, art classes, and cozying up by the fireplace with a good book are also popular choices during the rainy days of January.
February
February continues the cool, rainy weather in Angwin, with average temperatures slightly warmer than January. Rainfall remains significant, averaging 5.53 inches (140 mm), although sunny days begin to increase as winter transitions to spring. Outdoor activities such as wine tours, scenic drives, and visiting local museums and art galleries are enjoyable during breaks in the rain. Indoor activities such as cooking classes, wine tastings, and attending cultural events offer entertainment options for residents and visitors alike.
March
March marks the transition to spring in Angwin, with milder temperatures and decreasing rainfall compared to the winter months. Average temperatures rise to around 62°F (17°C), while precipitation levels gradually decrease to 5.32 inches (135 mm). Sunny days become more frequent, providing opportunities for outdoor activities such as hiking, picnicking, and gardening. March also offers opportunities for wine tasting events, outdoor concerts, and nature walks amidst the blooming wildflowers.
April
April brings mild spring weather to Angwin, with average temperatures reaching around 66°F (19°C) during the day. Rainfall decreases significantly compared to the previous months, averaging 2.48 inches (63 mm), allowing residents and visitors to enjoy more outdoor activities. Sunny days are abundant, making it an ideal time for hiking, biking, and exploring the scenic beauty of the Napa Valley region. April also marks the beginning of the wine grape growing season, with vineyards coming to life with vibrant greenery and blossoms.
May
May signals the arrival of warmer temperatures in Angwin, with average highs reaching around 73°F (23°C). Rainfall continues to decrease, averaging 1.14 inches (29 mm), while sunny days become more prevalent. Outdoor activities such as wine tasting tours, hot air balloon rides, and outdoor concerts are popular choices for residents and visitors looking to enjoy the beautiful weather. May also offers opportunities for farmers’ markets, outdoor dining, and visiting local gardens showcasing spring blooms.
June
June brings the onset of summer in Angwin, with warm temperatures and minimal rainfall. Average highs reach around 82°F (28°C), creating ideal conditions for outdoor recreation. Rainfall decreases significantly to 0.38 inches (10 mm), while sunny days abound, providing ample opportunities for outdoor activities such as hiking, biking, and wine tasting. June also offers opportunities for outdoor festivals, farmers’ markets, and live music performances celebrating the summer season.
July
July is the warmest month of the year in Angwin, with average highs reaching around 89°F (32°C). Rainfall is minimal, averaging only 0.04 inches (1 mm), while sunny days dominate the month. Outdoor activities such as swimming, picnicking, and outdoor concerts are popular choices for residents and visitors seeking to beat the summer heat. July also offers opportunities for wine tasting events, barbecue cookouts, and stargazing under the clear night sky.
August
August continues the warm summer weather in Angwin, with average temperatures similar to those in July. Rainfall remains minimal, averaging 0.07 inches (2 mm), while sunny days continue to prevail. Outdoor activities such as hiking, biking, and wine tasting are still popular choices for residents and visitors looking to enjoy the summer sunshine. August also offers opportunities for outdoor dining, wine pairing dinners, and attending outdoor movie nights under the stars.
September
September marks the transition to fall in Angwin, with gradually decreasing temperatures and changing foliage. Average highs drop to around 85°F (29°C), creating more comfortable conditions for outdoor activities. Rainfall increases slightly compared to the summer months, averaging 0.41 inches (10 mm), but sunny days still dominate the month. Residents and visitors can enjoy outdoor recreation such as hiking, biking, and wine tasting amidst the fall colors of the Napa Valley region. September also offers opportunities for harvest festivals, grape stomping events, and wine release parties celebrating the autumn season.
October
October brings mild fall weather to Angwin, with average temperatures dropping to around 76°F (24°C) during the day. Rainfall increases compared to the summer months, averaging 2.15 inches (55 mm), but sunny days are still plentiful. Outdoor activities such as wine tasting tours, scenic drives, and pumpkin patch visits are popular choices for residents and visitors looking to enjoy the autumn season. October also offers opportunities for attending fall festivals, visiting haunted houses, and exploring corn mazes.
November
November signals the arrival of cooler temperatures and increased rainfall in Angwin, with average highs reaching around 64°F (18°C). Rainfall peaks during this month, averaging 4.68 inches (119 mm), but sunny days are still interspersed throughout the month. Outdoor activities such as hiking, birdwatching, and wine tasting are still enjoyable during breaks in the rain. November also offers opportunities for attending Thanksgiving feasts, holiday markets, and wine pairing dinners featuring seasonal ingredients.
December
December brings cool, wet weather to Angwin, with average temperatures around 56°F (13°C). Rainfall remains significant, averaging 6.18 inches (157 mm), but sunny days become less frequent as winter sets in. Despite the rain, residents and visitors can still enjoy outdoor activities such as holiday light displays, festive markets, and exploring the town’s scenic trails. Indoor activities such as wine tasting events, cooking classes, and holiday concerts offer entertainment options for those seeking shelter from the winter weather.